What can cause warped rotors?Then again, I did notice recently that there were signs of pad "imprinting" on my rotor (i.e., a clearly pad-shaped burn mark on my rotor). I'd like to say it can't be my driving habits, so perhaps your dragging pad hypothesis is the case.

What can cause warped rotors?See my comment in reply to Mauro on the OP. It really does appear the Monroe guys were right: the warping ceased after I replaced the ball joints.

Sep26

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What can cause warped rotors?I'm pretty sure, and in hindsight I'm pretty sure they were right: I had the ball joints fixed (replaced the lower control arms) and there remains some pulsing (the rotor had become a little warped) but it has not grown worse (whereas before replacing the ball joints the pulsing would gradually return after replacing a rotor).